202011121981 has 2 divisors, whose sum is σ = 202011121982. Its totient is φ = 202011121980.

The previous prime is 202011121973. The next prime is 202011122021. The reversal of 202011121981 is 189121110202.

202011121981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 165026062756 + 36985059225 = 406234^2 + 192315^2 .

It is a cyclic number.

It is not a de Polignac number, because 202011121981 - 2³ = 202011121973 is a prime.

It is a super-2 number, since 2×202011121981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202011121901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101005560990 + 101005560991.

It is an arithmetic number, because the mean of its divisors is an integer number (101005560991).

Almost surely, 2^202011121981 is an apocalyptic number.

It is an amenable number.

202011121981 is a deficient number, since it is larger than the sum of its proper divisors (1).

202011121981 is an equidigital number, since it uses as much as digits as its factorization.

202011121981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 28.

The spelling of 202011121981 in words is "two hundred two billion, eleven million, one hundred twenty-one thousand, nine hundred eighty-one".